The St. Kitts and Nevis Olympic Committee sent a total of seven athletes to the Games, six men and one woman, to compete in athletics. Two of these athletes did not compete at these Games. Sprinter Tameka Williams withdrew from the games for admittedly using a banned-drug substance. Meanwhile, veteran sprinter Kim Collins, who reprised his role of carrying the nation's flag for the third time at the opening ceremony, was sent home by sporting committee, reportedly for spending the night with his wife at a London hotel.
The appearance of Saint Kitts and Nevis at the London Summer Olympics marked its fifth consecutive summer appearance since it first entered the Games during the 1996 Summer Olympics. As of these Olympics, Saint Kitts and Nevis had not won an Olympic medal. Kim Collins and Antoine Adams were the flagbearers for Saint Kitts and Nevis in the opening and closing ceremonies, respectively. They debuted at the 1996 Olympic Games with ten athletes, the most they have ever sent to the Games.
Antoine Adams finished fourth in the quarterfinals of the 100 meter sprint with a time of 10.22 seconds, advancing him to the semifinals. His seventh place finish in the semifinals, with a time of 10.27 seconds, eliminated him from competition. Adams also competed in the 200 meter sprint, finishing second in his heat with a time of 20.59 seconds, advancing to the semifinals. He was disqualified during the semifinals heat.
The 4 × 100 meter men's relay team—made up of Antoine Adams, Delwayne Delaney, Brijesh Lawrence, Jason Rogers, and Lestrod Roland—set a national record during the event with a time of 38.41 seconds. Although they set a national record, they placed sixth, which was not fast enough to advance them to the next round.
Kim Collins, who has competed in every Games that Saint Kitts and Nevis has participated in, was set to run the 100 meter dash. Collins was not allowed to compete by his Olympic committee after they found out he stayed with his wife, outside of the Olympic village. Collins required to get permission to stay outside the village for multiple nights in a row, and the committee stated he violated team discipline rules. On the issue of not being allowed to compete, Collins said "I feel that I should stay in a hotel with my wife, with or without their permission, that’s the honest to God truth whether they like it or not." He planned to never race for the country again, stating, "This is how it ends, it ends on a really sad note. I should have been allowed to run. I don’t see what is the big deal, I am a grown man, I’m just about to become a grandfather." Collins would later compete in the 2016 Olympics under the same flag.
Tameka Williams qualified to run in the 100 meter and 200 meter sprints. Williams, who would later compete in the 2016 Rio Olympics, was disqualified because she admitted that she used a banned substance. She voluntarily told her Olympic committee about using a banned substance, and it was announced on July 29 that she would not compete. Williams admitted to using a drug named Blast Off Red, which is typically used to enhance the performance of racehorses and greyhounds. Williams had posted on Facebook that she was innocent and had passed drug tests prior to the Olympics. While the drug is not listed as prohibited by the World Anti-Doping Agency, it falls into the category of veterinary medicine and therefore its use is not permitted.
|Antoine Adams||100 meter||Bye||10.22||4 q||10.27||7||Did not advance|||
|200 meter||20.59||2 Q||N/A||DSQ||Did not advance|||
|Jason Rogers||100 meter||Bye||10.30||5||Did not advance|||
|Kim Collins||100 meter||Bye||DNS||Did not advance|||
|4 × 100 meter relay||38.41 NR||6||N/A||Did not advance|||